Bug Fix: Added missing Head Block functionality

- Added Head Block (metadata) functionality
- Consistency: updated test_client_deuce_blocks.py to use 'block_id' instead of 'blockid'
- Bug Fix: There is no content-type returned for heading a block, even from Storage
Update: Version for Package
Merge pull request #40 from BenjamenMeyer/bugfix_finds_by_valere_3

Bugfix finds by valere 3
Bugfix finds by valere 4

- Updated pre-release version to 7
- no need to send the length of a block when querying for information about the block in a HEAD operation
- Various header fields should be passed around as text and translated to integers
  - ref-count
  - ref-modified
  - block size
- Ref-Modified should be an integer value
Merge pull request #41 from BenjamenMeyer/bugfix_finds_by_valere_4

Bugfix finds by valere 4
Adds initial travis-ci config file
fix: marker and limit logic

- bug fix, removal of ',' as querystring separator.
- use urlparse to set the querystring
Merge pull request #42 from TheSriram/marker_limit_bug_fix

fix: marker and limit logic
Update setup.cfg

Updating for release